Re: [Xen-devel] [timer/ticks related] dom0 hang during boot on large 1TB system

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> "Jan Beulich" <JBeulich@xxxxxxxxxx> 22.12.09 17:33 >>>
>One other irregular at the first glance thing is that the mentioned
>very first run through time_calibration() does not seem to result in
>running local_time_calibration() on CPU0. One invocation (apparently
>independent of time_calibration()) happens right before Dom0 starts
>executing.

And that's of course the problem: CPU0's TIME_CALIBRATE_SOFTIRQ can't
get serviced until entry to Dom0, but CPU0 is responsible for re-arming
calibration_timer. Hence there's a gap of calibrations, resulting in an
excessive delta observed during the first timer interrupt in Dom0.

Jan


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